On Wed, Mar 21, 2012 at 10:18:54PM -0400, Martin K. Petersen wrote: > >>>>> "Shaohua" == Shaohua Li <shli@xxxxxxxxxx> writes: > > Shaohua> Enabling discard merge is required for device with slow discard > Shaohua> (and very helpful for raid), > > Before RAID support there really wasn't much point. That's one of the > reasons the current discard merge code has survived despite being > completely broken. I've actually send repeated bug reports about it beeing broken when I enabled async discard in XFS which led to merges, and debugged it down to beeing a problem with merges. But Jens didn't like my patch to mark them nomerged, so we still couldn't commit the async discard support for XFS which would have helped quite a bit with discard performance. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
